Herz STOCKHOLM, Инструкция, Страница: 9 / 26

HERZ HIU STOCKHOLM
Page 9
Domestic water Heat exchanger
Routine servicing
– Check all connection seals, the heat exchanger should be cleaned every 2
years.
Component replacement
– Drain the primary and domestic sides of the unit. Undo all 4
connections and remove the heat exchanger. Replace the heat exchanger, refit the connection
nuts replacing the seals.
Space heating Heat exchanger
Routine servicing
– Check all connection seals, the heat exchanger should be removed and
flushed through every 2 years and cleaned if necessary.
Component replacement
– Drain both the primary and secondary sides of the unit, undo all 4
connections and remove the heat exchanger and replace, refit the connection nuts replacing the
seals and refill the secondary system to get the pressure back up to operating pressure.
Heat meter (if fitted)
Routine servicing
– Check all connection seals
Expansion vessel
Routine servicing - Check all connection seals, check pressure by closing the secondary ball
valves and venting the safety valve for 3 seconds, if the pressure drops by a small amount, the
expansion vessel is holding pressure and is ok. If the pressure drops by a large amount, the
expansion vessel is not maintaining pressure and needs replacing.
Component replacement
– Drain the secondary side of the unit and undo the capillary nut using
two spanners, undo the connection nut and remove the expansion vessel by lifting up to clear the
bracket and slide down and out to remove. Replace in the same way in reverse then refit the
connection nut and capillary nut. Refill the secondary system to get the pressure back up to
operating pressure.
Safety valve
Routine servicing
– Check all connection seals, action the valve by turning the handle anti-
clockwise and releasing.
Component replacement
– Drain the secondary side of the unit, undo the vent pipe connection
nut and remove keeping the connection intact, undo the safety valve and replace, then refit the
copper pipe connection nut. Refill the secondary system to get the pressure back up to operating
pressure.
Space Heating Circulating Pump
Routine servicing
– Check all connection seals
Component replacement
– Isolate the power supply to the pump, drain the secondary side of the
unit, disconnect the cable from the pump and undo 2 connection nuts. Remove the pump and
replace then refit the connection nuts, replacing the seals and reconnect the electric cable and test.
Refill the secondary system to get the pressure back up to operating pressure. Carry out pump
venting procedure as per the pump manual.